Which statement best describes the role and characteristics of a servo motor in automation?

Which statement best describes the role and characteristics of a servo motor in automation?

• A. It converts electrical energy into heat for lubrication
• B. It acts as a simple motor without feedback for general rotation
• C. It provides high torque at low speed with no control
• D. It is a precision motor with feedback, and the drive controls position, speed, and torque using that feedback

Answer: (D)

Servo motors in automation are about precise, controlled motion using feedback. A servo system combines the motor, a feedback device (like an encoder or resolver), and a drive that continuously compares the actual motor state with the commanded value and adjusts torque, speed, and position accordingly. This closed-loop control lets the motor reach and hold a exact position, move at specified speeds, and respond to changing loads with higher accuracy and stability. That makes the description of a precision motor with feedback, and a drive that uses that feedback to control position, speed, and torque, the most accurate portrayal of how servo motors work. The other ideas describe a simple, unregulated motor or misuse of energy (like heat for lubrication) and don’t capture the essential feedback and closed-loop control that defines servo systems.

Servo motors in automation are about precise, controlled motion using feedback. A servo system combines the motor, a feedback device (like an encoder or resolver), and a drive that continuously compares the actual motor state with the commanded value and adjusts torque, speed, and position accordingly. This closed-loop control lets the motor reach and hold a exact position, move at specified speeds, and respond to changing loads with higher accuracy and stability. That makes the description of a precision motor with feedback, and a drive that uses that feedback to control position, speed, and torque, the most accurate portrayal of how servo motors work. The other ideas describe a simple, unregulated motor or misuse of energy (like heat for lubrication) and don’t capture the essential feedback and closed-loop control that defines servo systems.